Nic"o*tine (? ∨ ?), n. [F. nicotine. See Nicotian.] (Chem.) An alkaloid which is the active principle of tobacco. It is a colorless, transparent, oily liquid, having an acrid odor, and an acrid burning taste. It is intensely poisonous.Ure.

The noun has 1 senses

1. nicotine -- an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide